sib vs cognate

sib and cognate both are nouns.

Word	Noun	Adjective	Verb	Adverb
sib	Yes	No	No	No
cognate	Yes	Yes	No	No

As nouns, sib and cognate are synonyms defined as:

sib and cognate: one related by blood or origin; especially on sharing an ancestor with another

Other synonyms of sib include blood relation, blood relative.

sib (noun)	cognate (noun)
one related by blood or origin; especially on sharing an ancestor with another	a word is cognate with another if both derive from the same word in an ancestral language
a person's brother or sister	one related by blood or origin; especially on sharing an ancestor with another

sib (adjective)	cognate (adjective)
	related by blood
	having the same ancestral language
	related in nature